In parallel with the development of the MMC and SD Card, design efforts pursuing the same objective resulted in the implementation of the Memory Stick from SONY. Today, it is mostly used in the company’s products and has quickly gained a sizable market share on this basis. However, it should be noted that there are number of different variants. In addition to the standard variant (only available up to 128 Mbytes), there is the Memory Stick Duo (a reduced-volume variant) for corresponding applications. Both types are also available as Magic Gate – similar to the SD Card, this is designed to prevent the unauthorized copying of copyright-protected content. The Memory Stick PRO was developed for applications that require higher memory capacities and/or faster data transfers (e.g. video recording) – however, it should be noted that this product is not compatible with many older applications. Another product is the Memory Stick Select, which uses a mechanical switch to override the existing upper limit of 128 Mbytes for the memory capacity.